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Finding the Fourth Proportional to 912.11, 1,365.41 and 586.80

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Solution

The fourth proportional to 912.11, 1,365.41 and 586.80 is: 878.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.11 : 1,365.41 = 586.80 : x
  2. Step 2: Convert to fraction form
    912.11/1,365.41 = 586.80/x
  3. Step 3: Cross multiply
    912.11x = 1,365.41 × 586.80
  4. Step 4: Simplify right side
    912.11x = 801,224.06
  5. Step 5: Solve for x
    x = 801,224.06/912.11
  6. Step 6: Final answer
    x = 878.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.